[Airflow-6110] [AIP-21] Rename GCP natural language operators

[michalslowikowski00]

PR contains changes regarding GCP natural language operators:

• renamed classes: CloudLanguageAnalyzeEntitiesOperator, CloudLanguageAnalyzeEntitySentimentOperator, CloudLanguageAnalyzeSentimentOperator, CloudLanguageClassifyTextOperator

• fixed testes

• updated UPDATING.md

• Description above provides context of the change

• Commit message contains [AIRFLOW-6110] or [AIRFLOW-XXXX] for document-only changes

• Unit tests coverage for changes (not needed for documentation changes)

• Commits follow "How to write a good git commit message"

• Relevant documentation is updated including usage instructions.

• I will engage committers as explained in Contribution Workflow Example.
  In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
  In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
  In case of backwards incompatible changes please leave a note in UPDATING.md.
  Read the Pull Request Guidelines for more information.

[codecov-io]

Codecov Report

Merging #6968 into master will decrease coverage by 0.29%.
The diff coverage is 84%.

@@            Coverage Diff            @@
##           master    #6968     +/-   ##
=========================================
- Coverage   84.81%   84.52%   -0.3%     
=========================================
  Files         679      679             
  Lines       38489    38505     +16     
=========================================
- Hits        32646    32547     -99     
- Misses       5843     5958    +115

Impacted Files	Coverage Δ
...gle/cloud/example_dags/example_natural_language.py	0% <0%> (ø)	⬆️
...oviders/google/cloud/operators/natural_language.py	100% <100%> (ø)	⬆️
...contrib/operators/gcp_natural_language_operator.py	100% <100%> (ø)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.75% <0%> (-20%)	⬇️
airflow/jobs/backfill_job.py	90.43% <0%> (-1.45%)	⬇️

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